Mechanism for facilitating installation of metal insert in injection mold

Abstract

A mechanism for facilitating installation of a metal insert in an injection mold belongs to the field of structural design of injection molds and comprises an ejector pin, a small reset rod, a delay nail, a limiting column, an ejector pin fixing plate, an ejector plate and a mold movable plate, the ejector pin is arranged on the ejector pin fixing plate, an ejector rod at one end penetrates through the mold movable plate, and a metal insert installation boss is arranged at the top of the ejector rod. The small reset rod is a step-shaped shaft, one end of the small reset rod is a back-ejecting cap which is installed in the ejector pin fixing plate, the plane of one side of the bottom of the small reset rod abuts against the upper end face of the ejector pin bottom table, and the other end of the small reset rod is a reset shaft which protrudes out of the surface of the ejector pin fixing plate; according to the injection molding mold, the problems that a metal insert is installed on an injection molding product and demolding is difficult are effectively solved, the production efficiency is improved, and the labor cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of injection mold structure design, in particular to a mechanism for facilitating the installation of metal inserts in an injection mold. Background Art

[0002] In current injection molding production, products with metal inserts are becoming more and more common. However, due to the limitations of the mold structure, the inserts will be in a small space in or around the mold groove, which makes the installation process of the metal inserts difficult. At the same time, due to the unreasonable design of some mold structures, when the injection molding is completed and the mold is demolded, the metal inserts are sometimes stuck in the mold and cannot be removed at the same time as the injection molded product, resulting in low production efficiency and high labor costs. It may even cause damage to the inserts and increase the defective rate.

[0003] Based on the above-mentioned deficiencies in the prior art, the utility model provides a mold mechanism which is convenient for installing and placing a metal insert in a mold and can be smoothly demoulded after the injection molding is completed. Summary of the invention

[0004] To achieve the above-mentioned purpose, the technical scheme of the utility model is: a mechanism for facilitating the installation of metal inserts in an injection mold, comprising: an ejector, a small reset rod, a delay nail, a limit column, an ejector fixing plate, an ejector plate and a mold movable plate, wherein the ejector is arranged on the ejector fixing plate, one end of the ejector rod passes through the mold movable plate and is clearance-matched with the axial hole of the mold movable plate, a metal insert mounting boss is arranged on the top of the ejector rod, and a bottom platform is arranged on the other end, and the bottom platform is arranged in the ejector fixing plate, the small reset rod is a stepped shaft, one end of the large diameter shaft is a return cap, which is arranged in the ejector fixing plate, and a plane on one side of the bottom is in contact with a plane on an upper end surface of one side of the ejector bottom platform, and the other end of the small diameter shaft is a reset shaft, which protrudes from the surface of the ejector fixing plate, the delay nail is arranged in the ejector plate, and a top surface on one end is in contact with a plane on a lower end surface of the ejector bottom platform, the limit column is arranged on the upper surface of the ejector fixing plate, and its height is less than the height of the reset shaft of the small reset rod protruding from the surface of the ejector fixing plate, and the ejector fixing plate is arranged parallel to the upper side of the ejector plate.

[0005] The technical effect of the utility model is mainly reflected in that the structure and position design of the ejector pin, small reset rod, delay pin and limit column solves the problem of metal inserts getting stuck on the ejector pin during demoulding, ensuring that the ejector pin can move in a predetermined time sequence and demould smoothly. At the same time, after demoulding, the ejector pin protrudes from the mold plane, leaving space for installing the metal insert, making the next round of injection molding process smoother.

[0006] In summary, the design of the utility model is simple and effective. By optimizing the mold structure, it improves production efficiency, reduces labor costs, and reduces the defective product rate. Workers are more convenient to operate without excessive human intervention, and can avoid quality problems caused by damage to metal inserts or improper installation. This reliable solution not only improves the efficiency and quality of injection molding production, but also reduces production costs, providing a more stable and reliable process guarantee for the production of injection molding products containing metal inserts. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic plan view of the overall structure of the utility model;

[0008] Figure 2 It is a three-dimensional exploded schematic diagram of the utility model;

[0009] Figure 3 It is a plane schematic diagram of the ejector fixing plate of the utility model;

[0010] Figure 4 It is a plan view of the utility model before the ejector pin is retracted during use;

[0011] Figure 5 It is a plane schematic diagram of the utility model after the ejector pin is retracted during use;

[0012] Figure 6 It is a plane schematic diagram of the mold after ejection during the use of the utility model.

[0013] In the figure: 1. ejector pin; 1-1. ejector rod; 1-2. boss; 1-3. base; 2. small reset rod; 2-1. reset shaft; 2-2. return cap; 3. delay pin; 4. limit column; 5. ejector fixing plate; 5-1. ejector countersunk hole; 5-2. small reset rod countersunk hole; 6. ejector plate; 6-1. delay pin countersunk hole; 7. mold movable plate; 7-1. shaft hole; 8. product; 9. metal insert. DETAILED DESCRIPTION

[0014] The utility model is now further explained in conjunction with the accompanying drawings. Figure 1-3 As shown, a mechanism for facilitating the installation of metal inserts in an injection mold includes an ejector pin 1, a small reset rod 2, a delay pin 3, a limit column 4, an ejector pin fixing plate 5, an ejector plate 6, and a mold movable plate 7;

[0015] The ejector pin 1 is a cylinder, which is arranged on the ejector pin fixing plate 5, and one end of which is an ejector pin 1-1. The ejector pin 1-1 passes through the mold movable plate 7 and is clearance-matched with the shaft hole 7-1 of the mold movable plate 7. The top end of the ejector pin 1-1 is processed with a boss 1-2 that matches the inner diameter of the metal insert installation. The other end of the ejector pin 1 is a stepped base 1-3, and the outer diameter of the base 1-3 is larger than the outer diameter of the ejector pin 1-1.

[0016] The small reset rod 2 is a stepped shaft type, which is arranged on the ejector fixing plate 5. One end of the large diameter shaft is a return cap 2-2, which is installed in the ejector fixing plate 5. The plane of one side of the bottom is against the upper end surface of the base 1-3 of the ejector 1, and the two are in plane contact. One end of the small diameter shaft is a reset shaft 2-1, which protrudes from the surface of the ejector fixing plate 5.

[0017] The time-delay pin 3 is also a stepped shaft, which is arranged in the ejector plate 6, and the top end of the large-diameter shaft is in flat contact with the lower end surface of the bottom platform 1-3 of the ejector pin 1;

[0018] The limiting column 4 is a cylinder, which is arranged on the upper surface of the ejector fixing plate 5, and its height is less than the height of the reset shaft 2-1 of the small reset rod 2 protruding from the surface of the ejector fixing plate 5. In this embodiment, the height difference is 4mm, that is, the retraction distance of the ejector 1, and can also be processed into different heights according to different product design requirements;

[0019] The ejector fixing plate 5 is rectangular, and one end is provided with two parallel adjacent cylindrical countersunk through holes, namely, an ejector countersunk hole 5-1 and a small reset rod countersunk hole 5-2, which are used to place the ejector 1 and the small reset rod 2 respectively, wherein the large diameter hole of the ejector countersunk hole 5-1 and the large diameter hole of the small reset rod countersunk hole 5-2 are arranged alternately, and the depth of the large diameter hole of the ejector countersunk hole 5-1 is less than the depth of the large diameter hole of the small reset rod countersunk hole 5-2; the large diameter hole and the small diameter hole of the ejector countersunk hole 5-1 are respectively matched with the ejector rod 1-1 of the ejector 1 and the base 1-3; the large diameter hole and the small diameter hole of the small reset rod countersunk hole 5-2 are respectively matched with the reset shaft 2-1 of the small reset rod 2 and the return cap 2-2;

[0020] The ejector plate 6 is rectangular, and one end is also provided with a cylindrical delay pin countersunk hole 6-1 for installing the delay pin 3. The position of the countersunk hole 6-1 is arranged opposite to the ejector pin countersunk hole 5-1. The depth of the large hole is 5mm, that is, 1mm more than the retreat distance of the ejector pin 1. In order to ensure the retreat distance of the ejector pin 1, different depths can also be processed according to different product design requirements;

[0021] When installing the device, first install the small reset rod 2 into the small reset rod countersunk hole 5-2 of the ejector fixing plate 5, and one end of it passes through the surface of the ejector fixing plate 5, then install the ejector 1 into the ejector countersunk hole 5-1 of the ejector fixing plate 5, and one side of the upper end surface of the base 1-3 of the ejector 1 is in plane contact with one side of the bottom of the return cap 2-2 of the small reset rod 2, and the ejector rod 1-1 of the ejector 1 passes through the mold movable plate 7; then install the delay nail 3 into the countersunk hole of the ejector plate 6, and make the top end of the large diameter shaft face the lower end surface of the base 1-3 of the ejector 1, and connect and fix the ejector fixing plate 5 and the ejector plate 6 with bolts.

[0022] like Figure 4-5As shown, the working process of this embodiment is: before injection molding, the metal insert 9 is installed on the top of the ejector pin 1. After the injection molding process is completed and before the product 8 is demoulded, that is, when the mold is ejected, the product 8 and the metal insert 9 will drive the ejector pin 1 to move upward due to their clamping force. The small reset rod 2 will move upward at the same time, and the delay pin 3 will also move upward after reaching the delay distance. When the top of the reset shaft 2-1 of the small reset rod 2 contacts the bottom surface of the mold movable plate 7, it stops moving. Since the bottom of the small reset rod 2 is against the upper end surface of the bottom platform 1-3 of the ejector pin 1, it will At the same time, the movement of ejector 1 is prevented, that is, ejector 1 moves downward relative to ejector fixing plate 5 under the action of small reset rod 2, and pushes delay pin 3 to move, and ejector fixing plate 5 continues to move upward. When limit column 4 contacts the bottom surface of mold movable plate 7, the ejection action of the mold is completed. At this time, ejector 1 moves downward a preset distance of 4mm under the push of small reset rod 2, so that the top of ejector 1 is separated from the metal insert 9 of the product by 4mm, weakening the holding force of product 8 and metal insert 9 on the ejector, making it easy to take out product 8.

[0023] like Figure 6 As shown, in further follow-up work, since the mold is in the ejection state, after the product is taken away, the ejector pin 1 will be higher than the high point of the mold movable plate 7. Next, when the metal insert 9 is installed on the top boss 1-2 of the ejector pin 1, the operator has a larger installation line of sight and installation space, thereby achieving the purpose of facilitating the installation of the metal insert 9.

Claims

1. A mechanism for facilitating the installation of metal inserts in an injection mold, characterized in that: include: An ejector pin (1), a small reset rod (2), a time delay pin (3), a limit column (4), an ejector pin fixing plate (5), an ejector plate (6) and a mold movable plate (7), wherein the ejector pin (1) is arranged on the ejector pin fixing plate (5), one end of the ejector pin (1-1) passes through the mold movable plate (7) and is clearance-matched with the shaft hole (7-1) of the mold movable plate (7), the top of the ejector pin (1-1) is provided with a metal insert mounting boss (1-2), and the other end is provided with a base (1-3), and the base (1-3) is arranged in the ejector pin fixing plate (5), the small reset rod (2) is a stepped shaft, and one end of the large diameter shaft is a return cap (2-2 ), which is arranged in the ejector fixing plate (5), and the plane of one side of the bottom contacts the plane of the upper end surface of one side of the base (1-3) of the ejector (1); the other end of the small diameter shaft is a reset shaft (2-1) which protrudes from the surface of the ejector fixing plate (5); the delay pin (3) is arranged in the ejection plate (6), and the top surface of one end contacts the plane of the lower end surface of the base (1-3) of the ejector (1); the limiting column (4) is arranged on the upper surface of the ejector fixing plate (5), and its height is less than the height of the reset shaft (2-1) of the small reset rod (2) protruding from the surface of the ejector fixing plate (5); the ejector fixing plate (5) is arranged parallel to the upper side of the ejection plate (6).

2. A mechanism for facilitating installation of metal inserts in an injection mold according to claim 1, characterized in that: The height of the reset shaft (2-1) of the small reset rod (2) protruding from the surface of the ejector fixing plate (5) is higher than the height of the limit column (4), and the height difference between the two is the preset retraction distance of the ejector (1).

3. A mechanism for facilitating installation of metal inserts in an injection mold according to claim 1, characterized in that: One end of the ejector pin fixing plate (5) is provided with two parallel adjacent cylindrical countersunk through holes, namely an ejector pin countersunk hole (5-1) and a small reset rod countersunk hole (5-2), which are used to assemble the ejector pin (1) and the small reset rod (2), respectively. The large hole of the ejector pin countersunk hole (5-1) and the large hole of the small reset rod countersunk hole (5-2) are arranged in an offset manner, and the depth of the large hole of the ejector pin countersunk hole (5-1) is less than the depth of the large hole of the small reset rod countersunk hole (5-2).

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